93 Jimmy fuel injection problem

Hi, I just got another suv, my 4th chevy!! This one is a 93 Jimmy SLT.
It has the 4.3 Vortec cpi (central port injection). It was running
real bad, but the engine sounded mechanically ok, so I bought it. I

changed plugs, cap, rotor, wires and it sounds better but still
missing. It was blowing blue/black smoke real bad at first and smelled
strongly of gas. It runs better but still is getting too much gas. My
mechanic said it sounds like the CPI unit, and he says they run about
$600. Does this sound kosher?
for what I paid for it, another $600 aint bad if it runs as good as I
think it will.
Let me know what you guys think.
jb

well to see if it is the cpi or nut kit leaking. take off the vortec
cover on top of the engine. Underneath it is a hockey puck looking
thing. Use a torx to remove it. Take a bright flashlight and look into
that sucker if it looks shiny on one side and dirty on another, it's
your cpi or nut kit.
Example of mine when it was bad
http://pg.photos.yahoo.com/ph/vwtopdown/detail?.dir Će6&.dnmF2a.jpg&.src=ph
snipped-for-privacy@msn.com wrote:

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